3121305505 has 16 divisors (see below), whose sum is σ = 3912059520. Its totient is φ = 2386251648.

The previous prime is 3121305493. The next prime is 3121305529. The reversal of 3121305505 is 5055031213.

3121305505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3121305505 - 2⁷ = 3121305377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3121305505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117061 + ... + 141229.

It is an arithmetic number, because the mean of its divisors is an integer number (244503720).

Almost surely, 2^3121305505 is an apocalyptic number.

It is an amenable number.

3121305505 is a deficient number, since it is larger than the sum of its proper divisors (790754015).

3121305505 is a wasteful number, since it uses less digits than its factorization.

3121305505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25320.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 3121305505 is about 55868.6450972278. The cubic root of 3121305505 is about 1461.4324942338.

Adding to 3121305505 its reverse (5055031213), we get a palindrome (8176336718).

The spelling of 3121305505 in words is "three billion, one hundred twenty-one million, three hundred five thousand, five hundred five".